649204055824 has 105 divisors (see below), whose sum is σ = 1369838717971. Its totient is φ = 298056381440.

The previous prime is 649204055761. The next prime is 649204055893. The reversal of 649204055824 is 428550402946.

The square root of 649204055824 is 805732.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 10 ways, for example, as 584093347600 + 65110708224 = 764260^2 + 255168^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 15834245244 + ... + 15834245284.

Almost surely, 2^649204055824 is an apocalyptic number.

649204055824 is the 805732-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649204055824

649204055824 is an abundant number, since it is smaller than the sum of its proper divisors (720634662147).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649204055824 is an frugal number, since it uses more digits than its factorization.

649204055824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 49.

Multiplying 649204055824 by its sum of digits (49), we get a square (31810998735376 = 5640124²).

The spelling of 649204055824 in words is "six hundred forty-nine billion, two hundred four million, fifty-five thousand, eight hundred twenty-four".